氮含量对29Cr铸造超级双相不锈钢深冷组织和性能的影响  

Effects of Nitrogen on Microstructure and Properties of 29Cr Cast Super Duplex Stainless Steel after Cryogenic Treatment

作　　者：黄伟林[1] 向红亮[2] 陈彤[1] 陈朝阳[1] 

机构地区：[1]国网福建省电力有限公司电力科学研究院,福州350007 [2]福州大学机械工程及自动化学院,福州350108

出　　处：《腐蚀与防护》2015年第8期711-716,共6页Corrosion & Protection

基　　金：科技部科技人员服务企业项目(2009GJC40018);福建省青年人才创新基金项目(2008F3061);福州大学科技发展基金项目(2008-QX-16)

摘　　要：采用金相显微镜(OM)、X射线衍射仪(XRD)、环境扫描电子显微镜(ESEM)、万能材料试验机、洛氏硬度计和电化学极化曲线研究了氮含量对经深冷处理的29Cr铸造超级双相不锈钢金相组织、力学性能和耐蚀性的影响。结果表明,深冷处理后,含氮量与奥氏体(γ)之间的关系为(γ)=99.4×w(N)+6.158 8;氮含量越高,试样的抗拉强度和延伸率越大;氮含量的提高可降低材料在人工海水中的腐蚀电流密度,提高耐蚀性。The effects of nitrogen content on microstructure,mechanical properties and corrosion resistance of 29 Cr cast super duplex stainless steel after cryogenic treatment were studied by modern means of optical microscopy（OM）,X-ray diffraction（XRD）,environmental scanning electron microscopy（ESEM）,universal testing machine,Rockwell hardness tester and electrochemical polarization curves.The results indicated that nitrogen could increase the amount ofγphase in the steel according to a linear relationship ofФ（γ）=99.4×w（N）＋6.158 8;and the higher the nitrogen content in the sample,the greater the tensile strength and the elongation;the increase of nitrogen could reduce the corrosion current density of the sample after cryogenic treatment,and improve the corrosion resistance.

关 键 词：29Cr铸造超级双相不锈钢 氮含量 深冷处理 力学性能 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]